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使用STM32模拟IIC控制ADS1115数据的低4位一直为0?

Other Parts Discussed in Thread: ADS1115

在使用模拟IIC读取ADS1115芯片,读取AD值,出现的ADC值低4位一直为0,满量程值为0X7FF0,其它电压值低4位一直为0,这是为什么?